Open AccessPerformance of entomopathogenic nematodes on the mealybug, Dysmicoccus brevipes (Hemiptera: Pseudococcidae) and the compatibility of control agents with nematodes
Author(s) -
Marcelo Zart,
Mariana Ferracim de Macedo,
Jael Simões Santos Rando,
Gabriela Souza Doneze,
Cassia Pereira Brito,
Rodrigo de Souza Poletto,
Viviane Sandra Alves
Publication year - 2021
Publication title -
journal of nematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.558
H-Index - 58
eISSN - 2640-396X
pISSN - 0022-300X
DOI - 10.21307/jofnem-2021-020
Subject(s) - mealybug , biology , hemiptera , biological pest control , infectivity , compatibility (geochemistry) , horticulture , rhabditida , nematode , botany , entomopathogenic nematode , veterinary medicine , ecology , virology , geology , medicine , virus , geochemistry
The performance of nine isolates of Heterorhabditis amazonensis and one of Heterorhabditis indica on the mealybug Dysmicoccus brevipes, (Hemiptera: Pseudococcidae), were evaluated. The most virulent isolates were evaluated for nematode vertical and horizontal dispersal, and for efficiency at concentrations of 0 (control), 25, 50, 75, and 100 infective juveniles (IJs)/cm 2 on adult females of the insect. A compatibility assessment was also carried out with commercial products, registered or in the process of registration, for use in the cassava culture. The isolates that caused the highest mortality rate of D. brevipes were NEPET11 (93.8% ± 4.1) and IBCB-n40 (84.0% ± 8.1), both isolates of Heterorhabditis amazonensis , while the isolate NEPET11 was more virulent than IBCB-n40 at all concentrations evaluated. In the dispersal test, the NEPET11 isolate caused mortality in the mealybug at a depth of up to 20 cm and a horizontal displacement of 7.25 cm. In the compatibility test, the NEPET11 isolate exhibited reduced viability due to the products Poquer, Tiguer 100 EC, Actara 250 WG, and Gaucho FS. The insecticide Curyom 550 EC was the only one that reduced infectivity (reduction of 92%) and is the only product classified as moderately toxic, while all the others were classified as compatible based on E%.